Yes, marriage, as far as it needs to be a government-sanctioned thing for wherever reason, should be a partnership of 2 or more consenting entities that are legally allowed to enter contracts. Like an LLC kind thing - the whole point, as far as government goes, is to provide asset management, is it not? Adding arbitrary restrictions is inelegant.
This. Why can't more people see it the way you have described? True marriage equality does not discriminate.
As it stands, the campaign for "marriage equality" is deceptive and has only been concerned with marriage between homosexuals - other minority groups be damned!
According to Chief Justice John Roberts, not exactly a liberal, marriage availability to homosexuals per the method you are describing amounts to sexual discrimination.